NSAttributedString mysteriously truncated too soon
NSAttributedString mysteriously truncated too soon
- Subject: NSAttributedString mysteriously truncated too soon
- From: Matt Neuburg <email@hidden>
- Date: Thu, 08 Nov 2012 13:23:23 -0800
I have a tall UILabel with numberOfLines 0 (meaning infinite). The problem remains the same even if numberOfLines is some large finite number such as 20, so that's not the source of the problem.
I am creating an attributed string like this:
NSString *s1 = @"The Gettysburg Address, as given by A. Lincoln on a certain occasion\n";
NSString *s2 = @"Four score and seven years ago, our fathers brought forth upon this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal.";
NSString* title = s1;
NSMutableAttributedString* content = [[NSMutableAttributedString alloc]
initWithString:title
attributes:@{NSFontAttributeName:[UIFont fontWithName:@"Arial-BoldMT" size:15],
NSForegroundColorAttributeName:[UIColor colorWithRed:0.251 green:0.000 blue:0.502 alpha:1],
NSKernAttributeName:[NSNull null]}];
NSString* blurb = s2;
NSMutableAttributedString* content2 = [[NSMutableAttributedString alloc]
initWithString:blurb
attributes:@{NSFontAttributeName:[UIFont fontWithName:@"Georgia" size:14],
NSKernAttributeName:[NSNull null]}];
[content appendAttributedString:content2];
// additional code will go here
self.lab.attributedText = content;
It works fine; I see the title and the paragraph. Now, you see where it says "additional code will go here"? In that spot, I add paragraph styles to my attributed string, like this:
NSMutableParagraphStyle* para = [NSMutableParagraphStyle new];
para.headIndent = 10;
para.firstLineHeadIndent = 10;
para.paragraphSpacingBefore = 5;
para.tailIndent = -1;
para.lineBreakMode = NSLineBreakByWordWrapping;
[content addAttribute:NSParagraphStyleAttributeName value:para range:NSMakeRange(0,title.length)];
para = [NSMutableParagraphStyle new];
para.headIndent = 10;
para.firstLineHeadIndent = 10;
para.tailIndent = -1;
para.lineBreakMode = NSLineBreakByTruncatingTail;
para.paragraphSpacing = 5;
[content addAttribute:NSParagraphStyleAttributeName value:para range:NSMakeRange(title.length,1)];
NSStringDrawingContext* con = [NSStringDrawingContext new];
CGRect r = [content boundingRectWithSize:CGSizeMake(280,10000) options:NSStringDrawingUsesLineFragmentOrigin context:con];
NSLog(@"%f", r.size.height);
The result (and this is the problem) is that the label truncates after the **first line** of the second paragraph ("Four score and seven years ago, our fa…"). Why? There's plenty of room in my label for more lines!
Moreover, I am trying to predict the height that my text will occupy. Right now I'm just logging the result, as shown above. Without those paragraph styles, I get 121, which looks right. With the paragraph styles, I get 53, which suggests that the truncation is taking place here too!
Now, I know that I can fix the problem by changing NSLineBreakByTruncatingTail to NSLineBreakByWordWrapping for the second paragraph. But I don't want to! Because if in fact the text is too long for the height of the actual label, I do want ellipses at the end!
So how can I get tail truncation **when the label is too short**, without getting **unnecessary** truncation after the first line of the second paragraph?
Thx - m.
--
matt neuburg, phd = email@hidden, http://www.apeth.net/matt/
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